package com.atguigu.gulimall.search.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.to.es.SkuEsModel;
import com.atguigu.common.utils.R;
import com.atguigu.gulimall.search.config.GulimallElasticSearchConfig;
import com.atguigu.gulimall.search.constant.EsConstant;
import com.atguigu.gulimall.search.feign.ProductFeignService;
import com.atguigu.gulimall.search.service.MallSearchService;
import com.atguigu.gulimall.search.vo.AttrResponseVo;
import com.atguigu.gulimall.search.vo.BrandVo;
import com.atguigu.gulimall.search.vo.SearchParam;
import com.atguigu.gulimall.search.vo.SearchResult;
import org.apache.lucene.search.join.ScoreMode;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.NestedQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.RangeQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.Aggregation;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.nested.NestedAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.nested.ParsedNested;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedLongTerms;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedStringTerms;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

@Service
public class MallSearchServiceImpl implements MallSearchService {
    @Autowired
    private RestHighLevelClient client;
    @Autowired
    private ProductFeignService productFeignService;
    @Override
    public SearchResult search(SearchParam param) {
        SearchResult result= null;
        //1、准备检索请求
        SearchRequest searchRequest = buildSearchRequest(param);


        try {
            //2、执行检索请求
            SearchResponse search = client.search(searchRequest, GulimallElasticSearchConfig.COMMON_OPTIONS);
            //3、分析相应数据封装成我们需要的格式

            result = buildSearchResult(search,param);
        } catch (IOException e) {
            e.printStackTrace();
        }


        return result;
    }
    private SearchRequest buildSearchRequest(SearchParam param) {
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
        /**
         * 查询：过滤（按照属性，分类，品牌，价格区间，库存）
         */
        //1、构建bool query
        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
        //1.1、must-模糊匹配
        if (!StringUtils.isEmpty(param.getKeyword())){
            boolQuery.must(QueryBuilders.matchQuery("skuTitle",param.getKeyword()));
        }
        //1.2、bool filter -按照三级分类id查询
        if (param.getCatalog3Id() != null){
            boolQuery.filter(QueryBuilders.termQuery("catalogId",param.getCatalog3Id()));
        }
        //1.2、 bool filter -按照品牌id查询
        if (param.getBrandId() != null && param.getBrandId().size() >0){
            boolQuery.filter(QueryBuilders.termsQuery("brandId",param.getBrandId()));
        }
        //1.2、 bool filter -按照所有指定属性查询
        if (param.getAttrs()!=null && param.getAttrs().size() >0){

            for (String attrStr : param.getAttrs()) {
                BoolQueryBuilder nestedBoolQuery = QueryBuilders.boolQuery();
                String[] s = attrStr.split("_");
                String attrId = s[0];
                String[] attrValues = s[1].split(":");
                nestedBoolQuery.must(QueryBuilders.termQuery("attrs.attrId",attrId));
                nestedBoolQuery.must(QueryBuilders.termsQuery("attrs.attrValue.keyword",attrValues));
                //每一个都得必须生成一个嵌入式的查询
                NestedQueryBuilder nestedQuery = QueryBuilders.nestedQuery("attrs", nestedBoolQuery, ScoreMode.None);
                boolQuery.filter(nestedQuery);
            }


        }
        //1.2、 bool filter -按照库存是否有进行查询
        if (param.getHasStock() != null){
            boolQuery.filter(QueryBuilders.termQuery("hasStock",param.getHasStock()==1));
        }


        //1.2、 bool filter -按照价格区间进行查询
        if (!StringUtils.isEmpty(param.getSkuPrice())){
            RangeQueryBuilder rangeQuery = QueryBuilders.rangeQuery("skuPrice");
            String[] s = param.getSkuPrice().split("_");
            rangeQuery.gte(s[0].equals("")?"0":s[0]);
            if (s.length>1){
                rangeQuery.lte(s[1]);
            }
//            if (s[0].equals(" ")){
//                rangeQuery.gte(s[0]).lte(s[1]);
//            }else if (s.length ==1){
//                if (param.getSkuPrice().startsWith("_"));
//            }
            boolQuery.filter(rangeQuery);
        }


        sourceBuilder.query(boolQuery);

        /**
         * 排序，分页，高亮
         */
        //2.1
        if (!StringUtils.isEmpty(param.getSort())){
            String[] s = param.getSort().split("_");
            sourceBuilder.sort(s[0],
                    s[1].equalsIgnoreCase("desc")? SortOrder.DESC:SortOrder.ASC);
        }
        //2.2
        //pageNum:1 from:0 size:5
        //pageNum:2 from:5 size:5
        //from = (pageNum - 1)*size
        sourceBuilder.from((param.getPageNum() - 1)*EsConstant.PRODUCT_PAGESIZE);
        sourceBuilder.size(EsConstant.PRODUCT_PAGESIZE);

        //2.3
        if (!StringUtils.isEmpty(param.getKeyword())){
            HighlightBuilder builder = new HighlightBuilder();
            builder.field("skuTitle");
            builder.preTags("<b style='color:red'>");
            builder.postTags("</b>");
            sourceBuilder.highlighter(builder);
        }

        /**
         * 聚合分析
         */
        //1.品牌聚合
        TermsAggregationBuilder brandAgg = AggregationBuilders.terms("brand_agg");
        brandAgg.field("brandId").size(50);

        //品牌聚合的子聚合
        brandAgg.subAggregation(AggregationBuilders.terms("brand_name_agg").field("brandName.keyword").size(1));
        brandAgg.subAggregation(AggregationBuilders.terms("brand_img_agg").field("brandImg.keyword").size(1));
        sourceBuilder.aggregation(brandAgg);


        //2.分类聚合
        TermsAggregationBuilder catalogAgg = AggregationBuilders.terms("catalog_agg");
        catalogAgg.field("catalogId").size(50);

        //分类聚合的子聚合
        catalogAgg.subAggregation(AggregationBuilders
                .terms("catalog_name_agg")
                .field("catalogName.keyword")
                .size(1));
        sourceBuilder.aggregation(catalogAgg);


        //3.属性聚合
        NestedAggregationBuilder attrAgg = AggregationBuilders.nested("attr_agg", "attrs");
        //聚合出当前所有的attrId
        TermsAggregationBuilder attrIdAgg = AggregationBuilders.terms("attr_id_agg").field("attrs.attrId");
        //聚合出当前所有的attrId对应的属性名和属性值
        attrIdAgg.subAggregation(AggregationBuilders
                .terms("attr_name_agg")
                .field("attrs.attrName.keyword")
                .size(1));
        attrIdAgg.subAggregation(AggregationBuilders
                .terms("attr_value_agg")
                .field("attrs.attrValue.keyword")
                .size(50));
        attrAgg.subAggregation(attrIdAgg);


        sourceBuilder.aggregation(attrAgg);


        System.out.println("构建的DSL："+sourceBuilder.toString());
        SearchRequest searchRequest = new SearchRequest(new String[]{EsConstant.PRODUCT_INDEX}, sourceBuilder);

        return searchRequest;
    }

    private SearchResult buildSearchResult(SearchResponse response,SearchParam param) {
        SearchResult result = new SearchResult();

        SearchHits hits = response.getHits();
        //1、返回所有查询到的商品
        // result.setProducts;
        List<SkuEsModel> esModels = new ArrayList<>();
        if (hits.getHits()!=null && hits.getHits().length>0){
            for (SearchHit hit : hits.getHits()) {
                String sourceAsString = hit.getSourceAsString();
                SkuEsModel skuEsModel = JSON.parseObject(sourceAsString, SkuEsModel.class);
                if (!StringUtils.isEmpty(param.getKeyword())){
                    HighlightField skuTitle = hit.getHighlightFields().get("skuTitle");
                    String string = skuTitle.getFragments()[0].string();
                    skuEsModel.setSkuTitle(string);
                }


                esModels.add(skuEsModel);
            }
        }
        result.setProducts(esModels);

        //2、当前所有商品涉及到的所有属性信息
        List<SearchResult.AttrVo> attrVos = new ArrayList<>();
        ParsedNested attr_agg = response.getAggregations().get("attr_agg");
        ParsedLongTerms attr_id_agg = attr_agg.getAggregations().get("attr_id_agg");
        for (Terms.Bucket bucket : attr_id_agg.getBuckets()) {
            SearchResult.AttrVo attrVo = new SearchResult.AttrVo();
            //1、得到属性的ID
            long attrId = bucket.getKeyAsNumber().longValue();
            attrVo.setAttrId(attrId);
            //2、得到属性的名字
            String attr_name = ((ParsedStringTerms) bucket.getAggregations().get("attr_name_agg"))
                    .getBuckets()
                    .get(0)
                    .getKeyAsString();
            attrVo.setAttrName(attr_name);
            //3、得到属性的所有值
            List<String> attr_values = ((ParsedStringTerms) bucket.getAggregations().get("attr_value_agg"))
                    .getBuckets()
                    .stream()
                    .map(item -> {
                        String keyAsString = item.getKeyAsString();
                        return keyAsString;
                    }).collect(Collectors.toList());
            attrVo.setAttrName(attr_name);
            attrVo.setAttrValue(attr_values);
            attrVos.add(attrVo);
        }

        result.setAttrs(attrVos);

        //3、当前所有商品涉及到的所有品牌信息
        List<SearchResult.BrandVo> brandVos = new ArrayList<>();
        ParsedLongTerms brand_agg = response.getAggregations().get("brand_agg");
        for (Terms.Bucket bucket : brand_agg.getBuckets()) {
            SearchResult.BrandVo brandVo = new SearchResult.BrandVo();
            //得到品牌ID
            long brandId = bucket.getKeyAsNumber().longValue();
            brandVo.setBrandId(brandId);
            //得到品牌的名字
            String brand_name= ((ParsedStringTerms) bucket.getAggregations().get("brand_name_agg"))
                    .getBuckets()
                    .get(0)
                    .getKeyAsString();
            brandVo.setBrandName(brand_name);

            //得到品牌的图片
            String brand_img= ((ParsedStringTerms) bucket.getAggregations().get("brand_img_agg"))
                    .getBuckets()
                    .get(0)
                    .getKeyAsString();
            brandVo.setBrandImg(brand_img);

            brandVos.add(brandVo);

        }
        result.setBrands(brandVos);

        //4、当前所有商品涉及到的所有分类信息
        ParsedLongTerms catalog_agg = response.getAggregations().get("catalog_agg");
        List<SearchResult.CatalogVo> catalogVos = new ArrayList<>();
        List<? extends Terms.Bucket> buckets = catalog_agg.getBuckets();
        for (Terms.Bucket bucket : buckets) {
            SearchResult.CatalogVo catalogVo = new SearchResult.CatalogVo();

            String keyAsString = bucket.getKeyAsString();
            catalogVo.setCatalogId(Long.parseLong(keyAsString));

            ParsedStringTerms catalog_name_agg = bucket.getAggregations().get("catalog_name_agg");
            String catalog_name = catalog_name_agg.getBuckets().get(0).getKeyAsString();
            catalogVo.setCatalogName(catalog_name);
            catalogVos.add(catalogVo);
        }
        result.setCatalogs(catalogVos);


        //5、分页信息-页码
        result.setPageNum(param.getPageNum());

        //6、分页信息-总记录数
        long totol = hits.getTotalHits().value;
        result.setTotal(totol);

        //7、总页数
        int totolPages = (int)totol%EsConstant.PRODUCT_PAGESIZE==0?
                (int)totol/EsConstant.PRODUCT_PAGESIZE:
                (int)totol/EsConstant.PRODUCT_PAGESIZE+1;
        result.setTotalPages(totolPages);
        // 设置导航页
        List<Integer> pageNavs = new ArrayList<>();
        for (int i = 1;i<=totolPages;i++){
            pageNavs.add(i);
        }
        result.setPageNavs(pageNavs);

        // 6.构建面包屑导航功能
        if(param.getAttrs() != null){
            List<SearchResult.NavVo> navVos = param.getAttrs().stream().map(attr -> {
                SearchResult.NavVo navVo = new SearchResult.NavVo();
                String[] s = attr.split("_");
                navVo.setNavValue(s[1]);
                R r = productFeignService.getAttrsInfo(Long.parseLong(s[0]));
                // 将已选择的请求参数添加进去 前端页面进行排除
                result.getAttrIds().add(Long.parseLong(s[0]));
                if(r.getCode() == 0){
                    AttrResponseVo data = r.getData("attr",new TypeReference<AttrResponseVo>(){});
                    navVo.setNavName(data.getAttrName());
                }else{
                    // 失败了就拿id作为名字
                    navVo.setNavName(s[0]);
                }
                // 拿到所有查询条件 替换查询条件
                String replace = replaceQueryString(param, attr, "attrs");
                navVo.setLink("http://search.gulimall.com/list.html?" + replace);
                return navVo;
            }).collect(Collectors.toList());
            result.setNavs(navVos);
        }
        // 品牌、分类
        if(param.getBrandId() != null && param.getBrandId().size() > 0){

            List<SearchResult.NavVo> navs = result.getNavs()==null?new ArrayList<>():result.getNavs();
            SearchResult.NavVo navVo = new SearchResult.NavVo();
            navVo.setNavName("品牌");
            // TODO 远程查询所有品牌
            R r = productFeignService.brandInfo(param.getBrandId());
            if(r.getCode() == 0){
                List<BrandVo> brand = r.getData("data", new TypeReference<List<BrandVo>>() {});
                StringBuffer buffer = new StringBuffer();
                // 替换所有品牌ID
                String replace = "";
                for (BrandVo brandVo : brand) {
                    buffer.append(brandVo.getName() + ";");
                    replace = replaceQueryString(param, brandVo.getBrandId() + "", "brandId");
                }
                navVo.setNavValue(buffer.toString());
                navVo.setLink("http://search.gulimall.com/list.html?" + replace);
            }
            navs.add(navVo);
//            result.setNavs(navs);
        }

        return result;
    }
    private String replaceQueryString(SearchParam param, String value, String key) {
        String encode = null;
        try {
            encode = URLEncoder.encode(value,"UTF-8");
            // 浏览器对空格的编码和java的不一样
            encode = encode.replace("+","%20");
            encode = encode.replace("%28", "(").replace("%29",")");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return param.get_queryString().replace("&" + key + "=" + encode, "");
    }

}
